Microparticle movements in optical funnels and pods.

Three-dimensional microparticle movements induced by laser beams with a funnel- and tubular pod-like structure, in the neighbourhood of the focal plane of an optical trapping setup, are experimentally studied. The funnel and pod beams constructed as coherent superpositions of helical Laguerre-Gaussian modes are synthesized by a computer generated hologram using a phase-only spatial light modulator. Particle tracking is achieved by in-line holography method which allows an accurate position measurement. It is experimentally demonstrated that the trapped particle follows different trajectories depending on the orbital angular momentum density of the beam. In particular applying the proposed pod beam the particle rotates in opposite directions during its movement in the optical trap. Possible applications of these single-beam traps for volumetric optical particle manipulation are discussed.

[1]  Jordi Andilla,et al.  Correction of aberration in holographic optical tweezers using a Shack-Hartmann sensor. , 2009, Applied optics.

[2]  Nir Davidson,et al.  A three dimensional dark focal spot uniformly surrounded by light , 2007 .

[3]  T. Alieva,et al.  Rotating beams in isotropic optical system. , 2010, Optics express.

[4]  Vladimir G. Volostnikov,et al.  Spiral light beams , 2004 .

[5]  Yael Roichman,et al.  Holographic optical trapping. , 2006, Applied optics.

[6]  Pavel Zemánek,et al.  Cellular and colloidal separation using optical forces. , 2007, Methods in cell biology.

[7]  Nir Davidson,et al.  Large-volume single-beam dark optical trap for atoms using binary phase elements , 2000 .

[8]  Alexander Jesacher,et al.  Holographic optical tweezers for object manipulations at an air-liquid surface. , 2006, Optics express.

[9]  M J Padgett,et al.  Generation of a beam with a dark focus surrounded by regions of higher intensity: the optical bottle beam. , 2000, Optics letters.

[10]  A Márquez,et al.  Time fluctuations of the phase modulation in a liquid crystal on silicon display: characterization and effects in diffractive optics. , 2008, Optics express.

[11]  D. Grier,et al.  Microoptomechanical pumps assembled and driven by holographic optical vortex arrays. , 2004, Optics express.

[12]  David G Grier,et al.  Volumetric imaging of holographic optical traps. , 2006, Optics express.

[13]  S. Barnett,et al.  Angular momentum of multimode and polarization patterns. , 2007, Optics express.

[14]  Arthur Ashkin,et al.  Optical Trapping and Manipulation of Neutral Particles Using Lasers: A Reprint Volume With Commentaries , 2006 .

[15]  Joseph P. Kirk,et al.  Phase-Only Complex-Valued Spatial Filter* , 1971 .

[16]  W Sibbett,et al.  Controlled Rotation of Optically Trapped Microscopic Particles , 2001, Science.

[17]  Alexander Jesacher,et al.  Size selective trapping with optical "cogwheel" tweezers. , 2004, Optics express.

[18]  T. Alieva,et al.  Orbital Angular Moment Density of Beam Given as a Superposition of Hermite-Laguerre-Gauss Functions , 2011 .

[19]  Miles J. Padgett,et al.  Light with a twist in its tail , 2000 .

[20]  M Montes-Usategui,et al.  Design strategies for optimizing holographic optical tweezers set-ups , 2007, physics/0701037.

[21]  Fook Chiong Cheong,et al.  Strategies for three-dimensional particle tracking with holographic video microscopy. , 2010, Optics express.

[22]  Jeffrey A. Davis,et al.  Encoding amplitude information onto phase-only filters. , 1999, Applied optics.

[23]  Svetlana P. Kotova,et al.  Microobject manipulations using laser beams with nonzero orbital angular momentum , 2006 .

[24]  Naoya Matsumoto,et al.  Mode purities of Laguerre-Gaussian beams generated via complex-amplitude modulation using phase-only spatial light modulators. , 2009, Optics letters.

[25]  Bo Sun,et al.  Theory of holographic optical trapping. , 2008, Optics express.

[26]  L. A. González,et al.  Pixelated phase computer holograms for the accurate encoding of scalar complex fields. , 2007, Journal of the Optical Society of America. A, Optics, image science, and vision.

[27]  Yael Roichman,et al.  Optical traps with geometric aberrations. , 2006, Applied optics.